Question

question 8 of 10
what is a combustion reaction?

a. a reaction between a molecule and oxygen that produces heat
b. a reaction between a molecule and carbon dioxide that produces oxygen
c. a reaction between water and oxygen that produces water vapor
d. a reaction between hydrogen and carbon that forms a hydrocarbon

Explanation:

A combustion reaction is defined as a chemical reaction where a substance (usually a fuel, a molecule containing carbon and hydrogen, or other combustible substances) reacts with oxygen, and this reaction releases heat (and often light). Option A matches this definition. Option B is incorrect as combustion doesn't involve reacting with carbon dioxide to produce oxygen. Option C is a physical change (vaporization) or a non - combustion reaction, not a combustion reaction. Option D describes the formation of a hydrocarbon, not a combustion reaction.

Answer:

A. A reaction between a molecule and oxygen that produces heat